A report shows a fifth of people will only realise what day it is when they check Facebook and Twitter.

And one in ten will hear about it from a colleague.

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SHROVE TUESDAY: One in ten will hear about it from a colleague

The Sainsbury’s research reveals 55% will forget it is Shrove Tuesday, when leftover foods that will not last the 40 days of Lent are traditionally used up.

Paul Crewe, head of sustainability, energy and environment at Sainsbury’s said: “Historically, pancakes were a great way of using up milk, butter and eggs before fasting.

PAN-tastic

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CLASSIC: The classic American pancakes with maple syrup and blueberries

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TRADITION: A fifth of Britons will honour Shrove Tuesday

“However, in today’s busy world it’s no surprise that so many of us forget to check the cupboards and fridge before deciding what to buy.

“Our findings did reveal that a fifth of Britons would honour the tradition of Shrove Tuesday and use leftovers to mark the occasion, so we’re calling upon the nation to have a ‘Plancake Day’ and check what’s in before buying.”